/*
* Adjust sock sync properties.
*/
static int adjust_sock_sync_prop(struct sock *sk, struct bst_sock_sync_prop *sync_p)
{
struct tcp_sock *tp;
struct sk_buff *skb = NULL;
u32 seq_changed = 0;
u32 new_seq;
tp = tcp_sk(sk);
new_seq = sync_p->seq;
/*
* There may be more than one sk_buff in tcp write queue,
* Adjust them all.
*/
skb = tcp_write_queue_head(sk);
while (NULL != skb) {
struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
if (skb == tcp_write_queue_head(sk)) {
if (new_seq < tcb->seq) {
seq_changed = BST_MAX_SEQ_VALUE - tcb->seq;
seq_changed += new_seq;
} else {
seq_changed = new_seq - tcb->seq;
}
new_seq = tp->write_seq + seq_changed;
}
tcb->seq += seq_changed;
tcb->end_seq += seq_changed;
if (!tcp_skb_is_last(sk, skb))
skb = tcp_write_queue_next(sk, skb);
else
skb = NULL;
}
if (NULL == tcp_write_queue_head(sk)) {
seq_changed = new_seq - tp->write_seq;
}
tp->write_seq = new_seq;
tp->rcv_nxt = sync_p->rcv_nxt;
tp->snd_wnd = sync_p->snd_wnd;
tp->snd_nxt += seq_changed;
tp->copied_seq = tp->rcv_nxt;
tp->rcv_wup = tp->rcv_nxt;
tp->snd_una += seq_changed;
if (likely(tp->rx_opt.tstamp_ok)) {
tp->tsoffset = sync_p->ts_current - tcp_time_stamp;
bastet_store_ts_recent(tp, sync_p->ts_recent, sync_p->ts_recent_tick);
}
return 0;
}
/**
* Cleans the meta-socket retransmission queue and the reinject-queue.
* @sk must be the metasocket.
*/
static void mptcp_clean_rtx_queue(struct sock *meta_sk, u32 prior_snd_una)
{
struct sk_buff *skb, *tmp;
struct tcp_sock *meta_tp = tcp_sk(meta_sk);
struct mptcp_cb *mpcb = meta_tp->mpcb;
int acked = 0;
while ((skb = tcp_write_queue_head(meta_sk)) &&
skb != tcp_send_head(meta_sk)) {
if (before(meta_tp->snd_una, TCP_SKB_CB(skb)->end_seq))
break;
tcp_unlink_write_queue(skb, meta_sk);
if (mptcp_is_data_fin(skb)) {
struct sock *sk_it;
/* DATA_FIN has been acknowledged - now we can close
* the subflows
*/
mptcp_for_each_sk(mpcb, sk_it) {
unsigned long delay = 0;
/* If we are the passive closer, don't trigger
* subflow-fin until the subflow has been finned
* by the peer - thus we add a delay.
*/
if (mpcb->passive_close &&
sk_it->sk_state == TCP_ESTABLISHED)
delay = inet_csk(sk_it)->icsk_rto << 3;
mptcp_sub_close(sk_it, delay);
}
}
meta_tp->packets_out -= tcp_skb_pcount(skb);
sk_wmem_free_skb(meta_sk, skb);
acked = 1;
}